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POSTRETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan asset allocations (as a percent) | 100.00% | 100.00% |
Employer contributions | $ 280 | $ 276 |
Estimated employer contributions in next fiscal year | 350 |  |
Defined contribution plans expense | 6,570 | 6,396 | $ 5,483
Liability | $ 3,598 | $ 3,974 |
Defined Benefit Plan, Type [Extensible Enumeration] | Pension Plan [Member] |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent
Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Policy target allocation (as a percentage) | 100.00% |  |
Plan asset allocations (as a percent) | 97.00% | 96.00% |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan asset allocations (as a percent) | 3.00% | 4.00% |

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